A Ga-Sn liquid metal-mediated structural cathode for Li-O2 batteries

Luo, Z., Ji, C., Yin, L., Zhu, G., Xu, B.B., Wang, Y., Liu, T.X., Zhuge, X. and Luo, K. 2020. A Ga-Sn liquid metal-mediated structural cathode for Li-O2 batteries. Materials Today Energy 18 , 100559. 10.1016/j.mtener.2020.100559

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Abstract

One of the recent challenges in Li–O2 battery technology is the cycle life, which can be severely shortened by cathode passivation induced by discharge product accumulation; this can be eliminated by reducing the amount of discharge products. Herein, we report a feasibility study on the development of a Ga–Sn liquid metal (LM)-functionalized multiwalled carbon nanotubes (MWNTs) cathode. In a comparison of MWNT, LM, m-LM/MWNT (pre-mixed LM and MWNTs), and LM/MWNT (LM-modified MWNTs) cathodes, morphology analysis showed that small Li2O2 flakes rather than large crystals grow on the conductive Ga–Sn LM and MWNTs of the LM/MWNT cathode only. The decomposition of the flaky Li2O2 on the LM/MWNT cathode occurred at lower charge overpotentials, resulting in low polarization; thus, the cathode passivation and the consumption of the Li anode were both alleviated during the cyclic process. The LM/MWNT cathode significantly improved the cycle life, rate performance, and ultimate capacity of Li–O2 batteries.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Chemistry Cardiff Catalysis Institute (CCI)
Publisher:	Elsevier
ISSN:	2468-6069
Date of Acceptance:	7 October 2020
Last Modified:	24 Feb 2023 15:00
URI:	https://orca.cardiff.ac.uk/id/eprint/155261

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